I have a raster map in QGIS imported from a GRASS mapset with the QGIS GRASS plugin. The problem is that I have null() cells in the GRASS map that appear "colored" in QGIS. How can I set the transparency?

I have tried in 'Proprieties' but it seems that it doesn't work. I would like to know a simple way to solve my problem.

  • When I add a GRASS raster into the QGIS map canvas, null cells are transparent. <shrug> – Micha Nov 5 '12 at 7:53
  • I tested on 3 machines. I can see in the layer's properties window - Transparency tab - the value -2e+09 (MAXINT) is set to 100% transparent. – Micha Nov 5 '12 at 8:01
  • hi, thanks for the answer. I noticed the layer's properties and I saw that there is a value of -1e+30 Anyway I doubt that the problem is the value. Have you set other things after you imported the grass map? because I still have a colored background instead of null cells transparency. – mattrx86 Nov 5 '12 at 8:39
  • Can you kindly help me @Micha? – mattrx86 Nov 5 '12 at 20:55
  • @mattrx86, could you clarify if you see the colored null cells when you first import the raster, or after you have assigned a colormap to it? – dericke Mar 17 '13 at 1:04

This sounds like Bug #4794, which is fixed in trunk and will graduate to the stable release in QGIS 2.0.

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